The last 20% of this book was a different one entirely. All that build up and getting attached to these kids, watching them struggle. The idea of keeping kids alive till they‘re an “adult”, just to harvest their body to save others life‘s…. This is a world that never found out making synthetic body parts, so they take from the (still) alive candidates. The twists come hard and fast by the end. Not my favorite from the author, but I get the point.